API: First steps to support subscriptions

src/Object/Api/Mastodon/Subscription.php

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+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Object\Api\Mastodon;
+
+use Friendica\BaseDataTransferObject;
+
+/**
+ * Class Subscription
+ *
+ * @see https://docs.joinmastodon.org/entities/pushsubscription
+ */
+class Subscription extends BaseDataTransferObject
+{
+	/** @var string */
+	protected $id;
+	/** @var string|null (URL)*/
+	protected $endpoint;
+	/** @var array */
+	protected $alerts;
+	/** @var string */
+	protected $server_key;
+
+	/**
+	 * Creates a subscription record from an item record.
+	 *
+	 * @param array   $subscription
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 */
+	public function __construct(array $subscription, string $vapid)
+	{
+		$this->id       = (string)$subscription['id'];
+		$this->endpoint = $subscription['endpoint'];
+		$this->alerts   = [
+			'follow'    => $subscription['follow'],
+			'favourite' => $subscription['favourite'],
+			'reblog'    => $subscription['reblog'],
+			'mention'   => $subscription['mention'],
+			'mention'   => $subscription['mention'],
+			'poll'      => $subscription['poll'],
+		];
+
+		$this->server_key = $vapid;
+	}
+}